Zoom Optical Lens Group Layout for Compact 3×-10× Camera Modules
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Solution Overview
Problem
Existing camera modules in portable terminals face challenges in achieving auto-focusing with high magnification due to the difficulty in designing a movable optical system within a small space, leading to reduced resolution and digital degradation during zooming.
Innovation Solution
A zoom optical system comprising a first, second, third, and fourth lens group, where the second and third lens groups are movable, with specific focal length and movement stroke definitions, and including a right-angled prism, to enable continuous zooming and maintain high resolution across various magnifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a movable lens system is designed to achieve auto-focusing and zooming, then magnification and resolution are improved, but the device size and complexity increase
Solution Approach 1:
The optical system is divided into four distinct lens groups (first, second, third, and fourth lens groups) with different functions. The first and fourth groups are fixed while the second and third groups are movable, allowing independent control of zooming and focusing operations. This segmentation enables complex optical functions to be achieved through coordinated movement of multiple simpler subsystems rather than a single complex movable lens assembly.
Solution Approach 2:
The patent implements dynamic zooming and focusing capabilities by making the second and third lens groups movable along the optical axis. The second lens group moves to adjust magnification (zooming) while the third lens group moves to adjust focus distance. This dynamic configuration allows the system to adapt its optical properties continuously without requiring a completely reconfigurable optical system.
2Volume of moving object
If the optical system is miniaturized for portable terminals, then device size is reduced, but the movement stroke and zooming capability are limited
Solution Approach 1:
The patent utilizes the optical axis dimension efficiently by arranging four lens groups in sequence, allowing movement in one dimension (along the optical axis) to achieve multiple functions. The coordinated movement of the second and third lens groups along the optical axis enables both zooming and focusing without requiring lateral or rotational movements, thus minimizing the overall footprint of the camera module while maintaining adequate movement stroke for functional performance.
3Device complexity
If digital zooming is used to increase magnification, then device complexity is reduced, but image quality degrades
Solution Approach 1:
The patent replaces digital zooming algorithms with a mechanical optical zooming system. Instead of using software-based image processing to achieve magnification (which degrades image quality), the system uses the physical movement of the second lens group to optically zoom. This mechanical substitution maintains image quality by performing zooming through optical means rather than digital interpolation, while the coordinated movement with the third lens group ensures proper focusing is maintained throughout the zoom range.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system allows for continuous adjustment of magnification from 3× to 10× while maintaining high resolution, addressing the challenge of miniaturization and resolution loss in portable terminals.
Implementation Method 1
a zoom optical system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a view showing a zoom optical system according to a first embodiment of the present invention.
Data Source
AI summary
A zoom optical system according to an embodiment of the present invention includes a first lens group, a second lens group, a third lens group, and a fourth lens group which are sequentially arranged in a direction from a subject side to an image side, wherein the second lens group and the third lens group are movable, and an effective focal length (EFL) in a telephoto mode is defined by an expression below.11.5<EFLteleHimageD<12.5Here, EFLtele is the EFL of the zoom optical system in the telephoto mode, and tele HimageD is a half value of a diagonal length of a pixel area of an image sensor.